A guinea of George III's reign with a spade-shaped shield on the reverse.
黑桃几内（乔治三世统治时期发行的背面有黑桃形状盾牌的几尼金币）
Example sentencesExamples
As you rightly say, the imitation spade guineas dated 1797 were used as gaming counters.
After managing to prize it open with an iron bar she discovered a hoard of 200 spade guineas, so called because they featured a ‘spade’ shaped shield on them.
Note that the obverse is quite different from that of the spade guinea even though both picture George III.
The second, with a rather ugly design, became known as the spade guinea because of the spade-like shape of the shield, and it is now the cheapest of all the guineas.
During recent alterations a treasure trove of golden spade guineas were found beneath the hearth of the western fireplace in the lounge bar.